Prostrate annual or perennial to c. 30 cm diam., usually rooting from lower nodes, glabrous or shortly arachnoid near growing tips. Leaves obovate, (6–) 10–20 mm long, 2.5–8 mm wide, entire or shallowly serrate. Inflorescence a solitary capitulum, usually leaf-opposed; peduncle 0.5–3 mm long. Capitula biconvex to hemispherical, 3–5 mm diam.; involucral bracts obovate, 1–1.5 mm long; receptacle convex. Female florets 40–80, in 2–4 rows; corolla 0.2–0.4 mm long. Bisexual florets 4–14; corolla 0.5–0.7 mm long. Fruiting capitula disintegrating; bracts spreading to slightly deflexed; receptacle 1.5–2 mm diam., with pith layer barely developed. Achenes narrowly flattened-obovoid, 1.2–2.0 mm long, 0.5–0.8 mm wide, rounded to obtuse, with 3 or 4 primary ribs, these usually alternating with indistinct ribs, at least the primary ribs with short ascending to appressed hairs; pericarp between ribs membranous, slightly thickened at and shortly below apex.
Home